Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS4112751 A
Publication typeGrant
Application numberUS 05/809,515
Publication dateSep 12, 1978
Filing dateJun 24, 1977
Priority dateJun 28, 1976
Also published asDE2716024A1, DE2716024B2, DE2716024C3
Publication number05809515, 809515, US 4112751 A, US 4112751A, US-A-4112751, US4112751 A, US4112751A
InventorsHeinrich Grunbaum
Original AssigneeGruenbaum Heinrich
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Arrangement for measuring a radial force applied to a bearing
US 4112751 A
Abstract
An arrangement for measuring a radial force applied to a roller bearing of a device has an inner element connected with the roller bearing for joint displacement therewith under the action of this force, an outer element mountable on the device and outwardly surrounding the inner element so as to form a gap therebetween, and a web extending through the gap and connecting the elements with each other. The web is stressed in response to displacement of the inner element with the roller bearing in a generally radial direction of the gap, whereby signals commensurate with the degree of stressing of the web are originated. The elements may be formed as rings concentric with each other, and the web may extend in the radial direction of the rings. Instrumentalities are provided for transmitting the above signals, such as electrical signalling instrumentalities. The latter may include two strain gauges mounted on the web. An arrangement may be provided for limiting the displacement of the inner element relative to the outer element.
Images(2)
Previous page
Next page
Claims(7)
What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims:
1. A bearing mounting unit for measuring a radial force applied to the mounted bearing, said unit comprising a unitary bearing mounting member having an outer annular portion and an inner annular portion surrounded by said outer annular portion ad defining therewith an annular gap, and a web extending across said gap and being of one piece with said portions so as to support said inner annular portion with freedom of radial displacement relative to said outer annular portion, said inner annular portion having an inner circumferential surface for receiving and retaining therein a rolling contact bearing, said inner and outer annular portions having respective faces which together bound said gap and which are provided at diametrically opposite locations with sets of concave recesses having open sides facing one another across said gap; a pair of overload protecting pins each received in one of said sets of concave recesses and extending parallel to one another and to a central axis of said member; and means mounted on the web for originating and transmitting signals commensurate with the stressing of said web resulting from the radial displacement of said inner annular portion relative to said outer annular portion.
2. The unit as defined in claim 1, wherein said inner and said outer portions are rings.
3. The unit as defined in claim 2, wherein said outer ring is concentric with said inner ring.
4. The unit as defined in claim 2, wherein said web extends in a substantially radial direction of said rings.
5. The unit as defined in claim 1, wherein said last mentioned means is an electric last mentioned means.
6. The unit as defined in claim 1, wherein said portions have an axis and said web has two side portions spaced from one another in a direction substantially transverse to said axis, said last mentioned means including two pairs of strain gauges each mounted on the respective side portion of said web; and further comprising an electrical measuring circuit including a measuring bridge which is formed by said two pairs of strain gauges.
7. The housing as defined in claim 1, wherein said portions have an axis; further comprising a further such inner portion, outer portion and web axially spaced from said first-mentioned inner portion, outer portion and web, said web and said further web each having two side portions spaced from each other in a direction substantially transverse to said axis, said last mentioned means including two pairs of strain gauges each mounted on the respective one of said webs so that one strain gauge of each pair is mounted on one of said side portions of the respective web whereas the other strain gauge of the same pair is mounted on the other side portion of the same web; and further comprising an electrical measuring circuit including a measuring bridge which is formed by said two pairs of gauges.
Description
BACKGROUND OF THE INVENTION

The present invention relates to an arrangement for measuring a radial force applied to a bearing, particularly a roller bearing.

Arrangements for measuring radial forces applied to roller bearings have found a wide use in machines for producing and treating textile fabrics, paper and foils of various kinds. Such arrangements are used for controlling the tension of bands or tapes and for measuring the loading of a transporting means. Various constructions of the above arrangements have already been proposed; however, these constructions are substantially complicated and expensive. This constitutes an essential disadvantage of the known arrangements which makes their use in serially produced inexpensive machines uneconomical.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide an arrangement for measuring a radial force applied to a bearing which avoids the disadvantages of the prior art arrangements.

More particularly, it is an object of the present invention to provide an arrangement for measuring a radial force applied to a bearing, which is of a simpler construction, less expensive and more compact than the prior art measuring arrangements.

In keeping with these objects, and with others which will become apparent hereinafter, one feature of the present invention is that an arrangement for measuring of a radial force applied to a roller bearing of a device comprises an inner element connected with the roller bearing for joint displacement therewith under the action of the radial force, an outer element mountable on the device and outwardly surrounding the inner element so as to form a gap therebetween, and a web extending through the gap, which web connects the above elements with each other and is stressed in response to displacement of the inner element together with the roller bearing in the radial direction of the gap, whereby signals commensurate with the stressing of the web are originated.

Such arrangement is of an extremely simple construction, easy to manufacture, inexpensive, and very compact. Dimensions of the above measuring arrangement scarcely exceed the dimensions of flanges of the roller bearing.

Another feature of the present invention is that the inner and the outer elements may be formed as rings which are concentric relative to each other. This facilitates mounting of the measuring arrangement of the respective device.

Still another feature of the present invention is that the arrangement comprises means for limiting the displacement of the inner element relative to the outer element, which means are located intermediate said elements. Such means prevent overloading of the web and may be formed as a pin received in a hole formed by two indentations which are provided in the elements and face towards one another.

Still another feature of the present invention is that the arrangement further includes electrical signalling means mounted on the web. These signalling means may be formed as strain gauges mounted on the opposite sides of the web. In this case, it is not required to use additional signal transmitting means which might otherwise produce hysteresis. The strain gauges are connected with an electrical measuring circuit and form together a measuring bridge of this circuit. Four such strain gauges are necessary for forming the complete measuring bridge. In this connection, the strain gauges may be so mounted on the web that one pair of the gauges is mounted on one side of the web whereas the other pair thereof is mounted on the other side of the web.

It is also possible to provide in the arrangement a second outer and inner element axially spaced from the first mentioned elements. In this case, two of the strain gauges are each mounted on the opposite sides of the web connecting the first elements, whereas the other two gauges are mounted on the web connecting the second elements.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a sectioned side view of an arrangement for measuring a radial force applied to a roller bearing, in accordance with the present invention;

FIG. 2 is a front view of an arrangement in accordance with the invention;

FIG. 3 is an enlarged view of a web which connects the inner and outer elements of an arrangement in accordance with the invention;

FIG. 4 is a side view of the web of FIG. 3;

FIG. 5 is a side view of the web of FIG. 3 in direction opposite to the side view of FIG. 4;

FIG. 6 shows an electrical measuring circuit operatively connected with an arrangement in accordance with the present invention; and

FIG. 7 shows another embodiment of an electrical measuring circuit operatively connected with an arrangement in accordance with the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

An arrangement for measuring a radial force applied to a roller bearing is shown in FIG. 1 and comprises a unit identified in toto by reference numeral 1' which includes an outer element 1 and an inner element 2 outwardly surrounded by the outer element 1 so as to form a gap therebetween. The elements 1 and 2 are connected with one another by a web 3. As shown in the drawing, the elements 1 and 2 are formed as concentric rings having an axis A, and the web 3 extends in the substantially radial direction of these rings. However, the elements 1 and 2 may have a configuration other than ring-shaped, and the web 3 may extend in a direction other than radial. The outer element 1 serves as a flange member for mounting the arrangement on a wall portion of a device or a machine. For this purpose it is provided with mounting bores 4 in which not-shown mounting elements may be inserted. The inner element 2 is mounted on a roller bearing 5 which is subject to a radial force to be measured. The roller bearing 5 rotates in the direction which corresponds to its operational conditions, and may be a self-aligning bearing.

The arrangement may comprise two units, one of which is the above-described unit 1' and the other of which is a unit 1" similar to the first mentioned unit 1'. Such arrangement is illustrated in FIG. 2 showing the units 1' and 1" spaced from each other in the axial direction. The inner rings of the units 1' and 1" are mounted on respective bearings which support opposite sides of a rotatable roller 8 of a transporting means of the device or of the machine. A transporting band 9 is located on the rollers 8 and loads the latter, so that the above radial force to be measured is produced. In spite of the fact that the transporting roller 8 is supported by two bearings located at the axial ends thereof, the measuring arrangement may comprise only one unit mounted on either of the bearings.

When the roller bearing 5 is loaded with a radial force F which results, for instance, from tension exerted by the transporting band 9, the inner element 2 is displaced relative to the outer ring 1 from its concentric position to the left or to the right, in dependence upon the direction of the applied radial force. In this case, the rules relating to one-sided bending of a cantilever are applicable, in accordance with which the displacement of the inner ring 2 as well as a compression and tension of the web 3 are proportional to the applied force F. The displacement of the inner ring 2 is transformed into signals which in turn are subsequently sensed so that the radial force may be determined from the thus sensed signals corresponding to the above displacement and, therefore, also corresponding to the applied radial force.

Whereas various signalling means can be used in the arrangement in accordance with the present invention, it is advantageous to use strain gauges which are known per se in the art. As shown in FIG. 3, the strain gauges are identified in toto by reference numeral 7 and are mounted on the side portions of the web 3. When the inner element 2 is displaced under the action of the radial force F in either direction, the strain gauge mounted on the one side portion of the web 3 is compressed whereas the strain gauge mounted on the other side portion of the web 3 is stretched.

When the arrangement comprises only one of the units, for instance the unit 1', four strain gauges A1', B1', C1', and D1', are mounted on the web 3 as shown in FIGS. 4 and 5 so that two of the strain gauges are located on the one side portion of the web, whereas the two other strain gauges are located on the other side portion of the web 3. FIG. 6 shows an electrical measuring circuit, including a measuring bridge which is formed by the above four strain gauges. When the arrangement comprises two units 1' and 1" as shown in FIG. 2 of the drawing, it suffices to mount two strain gauges on the web on each of the units, for instance, the strain gauges A1' and B1' on the web of the unit 1' and the strain gauges A1" and B1" on the web of the unit 1". The strain gauges A1' and A1" will be located on the one side portion of the respective web, whereas the strain gauges B1' and B1" will be located on the other side thereof. FIG. 7 shows an electrical measuring circuit with a measuring bridge formed in the case when both units 1' and 1" are provided in the arrangement. Here, two strain gauges A1' and B1' of the unit 1' are electrically connected with two strain gauges A1" and B1" of the unit 1" and form together with the same the above measuring bridge.

It should be mentioned that a force acting in a direction which is normal to the direction of force F, such as a weight of the transporting roller 8, does not affect the measurements of the force F inasmuch as such normal force simultaneously compresses or stretches all the strain gauges, and therefore no detuning of the measuring bridge will occur. Also, a horizontal component of this normal force does not affect the measurements because of the extremely small angle of turning.

Each of the above units of the arrangement may be produced from an integral steel ring, having a thickness corresponding to the width of the roller bearing 5, by means, for instance, of drilling and subsequent milling thereof so as to form the inner ring, the outer ring and the web connecting the rings with one another. It is understood that the units may also be made by other methods, such as cold forming, casting, forging, spark erosion and the like. The outer and inner elements may be made separately from and be subsequently connected with one another by the web which may be welded thereto or inserted in dovetail grooves provided in the elements. The configuration of the outer element 1 is not important for the present invention, and for this reason the outer element may be of a configuration other than annular, e.g., rectangular or otherwise.

The arrangement also comprises means for preventing the web 3 from overloading. For this purpose indentations are provided in the inner element 2 and the outer element 1, which indentations are located adjacent to and face towards one another so as to form together a hole. The above preventing means include pins 6 each located in the respective hole. The pins 6 prevent an excessive displacement of the inner ring 2 relative to the outer ring 1 whereby the overloading of the web 3 is prevented.

As shown in the drawing, the outer ring 1 and the inner ring 2 are concentric relative to one another for the reason that the axes of the mounting flanges must be in alignment with the axis of the roller bearing. Non-compliance with this requirement would not affect the operation of the arrangement; however, it would make mounting of the same on the machine rather difficult.

Whereas the signalling means shown in the drawing are strain gauges, it is understood that various other signalling means may be provided in the arrangement without departing from the basic concept of the present invention. Thus, magnetoelastic, inductive, capacitive, proximity, piezoelectric and like means may be used for transforming the displacement of the inner ring 2 under the action of the radial force F into signals to be subsequently sensed and measured.

Finally, the arrangement may be provided with covers mountable on the opposite sides of the elements, especially for protecting the electrical signalling means. Two covers may be provided which are centered and have portions extending through the mounting bores 4. One of the covers may have a standardized plug socket for connecting with a signal generator.

The units 1' and 1" may be made not only of steel but also of spring bronze, copper, berylium, titanium and other non-ferrous metals.

It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the types described above.

While the invention has been illustrated and described as embodied in an arrangement for measuring a radial force applied to a bearing, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3258962 *Feb 4, 1964Jul 5, 1966Asea AbMagneto-elastic force measuring device
US3763701 *Jul 5, 1972Oct 9, 1973G WardWeb tension devices
US3824846 *Apr 14, 1971Jul 23, 1974Bofors AbHolder for force transducer
US4015468 *Jul 3, 1975Apr 5, 1977Francois SimonDevice for the measurement of the radial force sustained by a rotary organ
DE2031979A1 *Jun 29, 1970Jan 5, 1972Weser AgTitle not available
Non-Patent Citations
Reference
1 *Ellis et al.--IBM Technical Disclosure Bulletin, vol. 16, No. 7, pp. 2267-2268, Dec. 1973.
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4281539 *Sep 10, 1979Aug 4, 1981Sro-Kugellagerwerke J. Schmid-Roost AgMeasuring apparatus, especially for measuring forces acting upon a bearing or the like
US4351237 *Jun 5, 1980Sep 28, 1982Veb Kombinat Polygraph "Werner Lamberz" LeipzigDevice for printing-pressure control
US4624145 *Mar 26, 1985Nov 25, 1986Allied CorporationRack and pinion reaction force sensor
US4704895 *Nov 16, 1985Nov 10, 1987Bergwerksverband GmbhMethod and device for monitoring roller drilling tools
US4939936 *Mar 25, 1987Jul 10, 1990Protos Precision Systems LimitedShapemeter
US5033315 *Mar 12, 1990Jul 23, 1991Gewerkschaft Eisenhutte Westfalia GmbhApparatus for determining the tension in a chain or the like
US6772648 *Oct 18, 2002Aug 10, 2004The Timken CompanyMethod and apparatus for determining bearing parameters
US6920801Nov 30, 2001Jul 26, 2005Skf Engineering And Research Centre B.V.Measurement device for measuring radial and/or axial forces
US7263901 *Jan 23, 2004Sep 4, 2007Fag Kugelfischer AgMethod and device for determining the direction of displacement of a roller bearing component
US7665372 *Apr 25, 2006Feb 23, 2010Jtekt CorporationRolling bearing device with sensor and strain sensor
US8047085May 27, 2009Nov 1, 2011Corning IncorporatedForce monitoring methods and apparatus
US8117923May 8, 2009Feb 21, 2012Shimano Inc.Bicycle bottom bracket force sensor
US8267383Jul 28, 2008Sep 18, 2012Honda Motor Company, Ltd.Mount devices and methods for measuring force
US8316723Oct 31, 2008Nov 27, 2012Aktiebolaget SkfCombination of bearing component and sensor
US8330311Apr 16, 2009Dec 11, 2012Dresser-Rand CompanyMagnetic thrust bearing with integrated electronics
US8453521May 10, 2011Jun 4, 2013Shimano Inc.Bicycle force sensing device
US8698367Apr 16, 2009Apr 15, 2014Synchrony, Inc.High-speed permanent magnet motor and generator with low-loss metal rotor
US8746081May 10, 2011Jun 10, 2014Shimano Inc.Bicycle force sensing assembly
US8987959Jun 23, 2011Mar 24, 2015Dresser-Rand CompanySplit magnetic thrust bearing
US9583991Jun 22, 2010Feb 28, 2017Synchrony, Inc.Systems, devices, and/or methods for managing magnetic bearings
US20040074315 *Oct 18, 2002Apr 22, 2004Hwang Wen RueyMethod and apparatus for determining bearing parameters
US20040261543 *Nov 30, 2001Dec 30, 2004Van Leeuwen Bernardus GerardusMeasurement device for measuring radial and/or axial forces
US20060144164 *Jan 23, 2004Jul 6, 2006Alfred PecherMethod and device for determing the direction of displacement of a roller bearing component
US20060243068 *Apr 25, 2006Nov 2, 2006Jtekt CorporationRolling bearing device with sensor and strain sensor
US20100019424 *Jul 28, 2008Jan 28, 2010Gagliano Charles JMount devices and methods for measuring force
US20100282001 *May 8, 2009Nov 11, 2010Shimano Inc.Bicycle bottom bracket force sensor
US20100300214 *May 27, 2009Dec 2, 2010Cady Raymond CForce monitoring methods and apparatus
EP0870574A1 *Apr 9, 1998Oct 14, 1998Hidenori ShinnoSensor, apparatus for determining machining state of machine tool, and method for determining state
EP1314871A2 *Nov 22, 2002May 28, 2003Robert Bosch GmbhProcess for determining bearing forces of a driven shaft , particularly for injection pumps of internal combustion engines
EP1314871A3 *Nov 22, 2002Oct 22, 2003Robert Bosch GmbhProcess for determining bearing forces of a driven shaft , particularly for injection pumps of internal combustion engines
EP2248715A2Sep 24, 2009Nov 10, 2010Shimano Inc.Bicycle bottom bracket force sensor
EP2248715B1 *Sep 24, 2009Jul 8, 2015Shimano Inc.Bicycle bottom bracket force sensor
WO2002044678A1 *Nov 30, 2001Jun 6, 2002Skf Engineering And Research Centre B.V.Measurement device for measuring radial and/or axial forces
WO2009056159A1 *Nov 2, 2007May 7, 2009Aktiebolaget SkfCombination of bearing component and sensor
WO2009056334A1Oct 31, 2008May 7, 2009Aktiebolaget SkfCombination of bearing component and sensor
WO2012080570A1 *Dec 12, 2011Jun 21, 2012Konecranes PlcArrangement for measuring radial forces in bearing
Classifications
U.S. Classification73/862.632, 73/862.634, 73/862.382, 73/862.474
International ClassificationG01L5/00, G01M13/04
Cooperative ClassificationF16C2370/00, G01M13/04, G01L5/0019, F16C35/045, F16C27/04, F16C19/522
European ClassificationF16C19/52L, G01L5/00C4, G01M13/04